The height of cylinder [[$ A $]] is [[$ 12 \;\text {cm} $]], and its diameter is [[$ 9 \;\text {cm} $]]. What does the height of cylinder [[$ B $]] have to be in order for it to be similar with cylinder [[$ A $]]? The diameter of cylinder [[$ B $]] is [[$ 12 \;\text {cm} $]].

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Answer: The height of the cylinder must be cm.